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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ML7396AB датащи(PDF) 74 Page - LAPIS Semiconductor Co., Ltd. |
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ML7396AB датащи(HTML) 74 Page - LAPIS Semiconductor Co., Ltd. |
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74 / 140 page  FEDL7396A/B/E-07 ML7396A/B/E 74/140 ●Programming IF Frequency In order to support various data rate , RX filters have to be optimised. The RX filter can be selected according to the IF frequency. IF frequency can be set by using [IF_FREQ_H: B1 0x0A] and [IF_FREQ_L: B1 0x0B] registers. (default: 178.22kHz) According to the RATE[2:0] ([DATA_SET:B0 0x47(2-0)]) setting and NBO_SEL([DATA_SET:B0 0x47(7)]) setting, IF frequency will be multiplied automatically as following table. Data rate NBO_SEL 50kbps 100kbps 150kbps 200kbps 400kbps 0b0 x2 x4 x4 x6 x6 0b1 x2 x2 - x4 - IF frequency value should be set as the multiplied IF frequency corresponding to each data rate becomes the values described in the following table. Data rate NBO_SEL 50kbps 100kbps 150kbps 200kbps 400kbps 0b0 500kHz 720kHz 900kHz 1300kHz 2100kHz 0b1 500kHz 720kHz - 1300kHz - [Notes] 1. NBO_SEL=0b1 can not be set for the data rate other than 50kbps, 100kbps and 200kbps. 2. For 10kbps, 20kbps, 40kbps setting, please refer to the "Initial register setting" file . If AFC is used, IF frequency setting in [IF _FREQ_AFC_H: B0 0x30] and [IF_FREQ_AFC_L: B0 0x31] registers will be used. IF frequency setting for AFC operation is same as normal operation. If CCA is used to detect channel carrier power, required RX filter bandwidth may be different. [IF _FREQ_CCA_H: B1 0x0C] and [IF_FREQ_CCA_L: B1 0x57] registers must be used for CCA purpose. During CCA operation IF frequency calculation becomes as below. Data rate NBO_SEL 50kbps 100kbps 150kbps 200kbps 400kbps 0b0 x2 x6 x8 x8 x8 0b1 x2 x2 - x6 - IF frequency value for CCA operation should be set as the multiplied IF frequency corresponding to each data rate becomes the values described in the following table. Data rate NBO_SEL 50kbps 100kbps 150kbps 200kbps 400kbps 0b0 500kHz 1500kHz 1450kHz 2000kHz 2100kHz 0b1 500kHz 720kHz - 1500kHz - [Notes] 1. NBO_SEL=0b1 can not be set for the data rate other than 50kbps, 100kbps and 200kbps. 2. For 10kbps, 20kbps, 40kbps setting, please refer to the "Initial register setting" file.. IF frequency setting value can be calculated using the following formula. IF_FREQ = {fIF / fREF} * 2 20 (Integr part) [note: using 20bit circuit] Here IF_FREQ : IF frequency setting fIF : IF frequency [MHz] fREF : PLL reference frequency (input clock=36MHz) [Example] When set IF frequency is 178.22kHz, the calculation are as follow. (fREF = 36MHz) IF_FREQ = {0.17822MHz / 36MHz} * 220 (Integer part) = 5191 (0x1447) Therefore [IF_FREQ_H] = 0x14 [IF_FREQ_L] = 0x47 |
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